Yesterday my microwave -Whirlpool MH6150XMS (built in above stove) would not heat food. Everything else works fine, but the food is not hot when it comes out no matter how long it heats for. It is just 3 to 4 years old. It had a new motherboard about a year ago because lightening apparently struck it and the fan would keep running once the microwave finished a cycle. Suggestions? How hard is this to fix on a built in unit, or would it be best to call a repairman? Thanks.
making a loud buzzing sound and won't heat
Hi
power spikes are very damaging to a microwaves internal parts, it sounds like your transformer and/or magnetron are blown. if the unit is out of warranty I would recommend calling a repairman or getting a new microwave (the transformer & magnetron are expensive and dangerous to work on) also get a small single plug surge protector for the new one.
SOURCE: Microwave does not heat/cook
Generally, the most common causes of a failure to heat are:
- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)
If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.
We're happy to help and we appreciate your thoughtful rating of our answer.
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